Speech to text works perfect. I spoke "how much wood would a woodchuck chuck if a woodchuck could chuck wood". then say "question mark". The spelling (would and wood) was perfect. I recommend MobiSystems OfficeSuite 6.
The speech to text works great on it. Its been part of android for years. Well before ipad/iphone added that features. I use that feature more on my phone than my tablet but i still find it useful on the tablet. I like like the google now commands too. Like I can say remind me to shut the oven off in one hour and it will set an alarm with the title shut the oven off for 1 hour from the current time.
It works really well. English it's my second language. Although i speak it fluently, from time to time i know i don't have a perfect diction. Either way, it seems to understand about anything. Also Google Now, and voice search works amazing.